Sofa



FIG. 1 is a front perspective view of a sofa, showing our new design;

FIG. 2 is a front elevation view thereof;

FIG. 3 is a rear perspective view thereof;

FIG. 4 is a side view thereof taken from the left of FIG. 2;

FIG. 5 is a side view thereof taken from the right of FIG. 2;

FIG. 6 is a top plan view thereof; and,

FIG. 7 is an underside view thereof. 

We claim the ornamental design for a sofa, as shown and described. 